lib/dim/rdma_dim.c

Source file repositories/reference/linux-study-clean/lib/dim/rdma_dim.c

File Facts

System
Linux kernel
Corpus path
lib/dim/rdma_dim.c
Extension
.c
Size
2642 bytes
Lines
110
Domain
Kernel Services
Bucket
lib
Inferred role
Kernel Services: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (stats_res) {
		case DIM_STATS_SAME:
			if (curr_stats->cpe_ratio <= 50 * prev_ix)
				dim->profile_ix = 0;
			break;
		case DIM_STATS_WORSE:
			dim_turn(dim);
			fallthrough;
		case DIM_STATS_BETTER:
			step_res = rdma_dim_step(dim);
			if (step_res == DIM_ON_EDGE)
				dim_turn(dim);
			break;
		}
	}

	dim->prev_stats = *curr_stats;

	return dim->profile_ix != prev_ix;
}

void rdma_dim(struct dim *dim, u64 completions)
{
	struct dim_sample *curr_sample = &dim->measuring_sample;
	struct dim_stats curr_stats;
	u32 nevents;

	dim_update_sample_with_comps(curr_sample->event_ctr + 1, 0, 0,
				     curr_sample->comp_ctr + completions,
				     &dim->measuring_sample);

	switch (dim->state) {
	case DIM_MEASURE_IN_PROGRESS:
		nevents = curr_sample->event_ctr - dim->start_sample.event_ctr;
		if (nevents < DIM_NEVENTS)
			break;
		if (!dim_calc_stats(&dim->start_sample, curr_sample, &curr_stats))
			break;
		if (rdma_dim_decision(&curr_stats, dim)) {
			dim->state = DIM_APPLY_NEW_PROFILE;
			schedule_work(&dim->work);
			break;
		}
		fallthrough;
	case DIM_START_MEASURE:
		dim->state = DIM_MEASURE_IN_PROGRESS;
		dim_update_sample_with_comps(curr_sample->event_ctr, 0, 0,
					     curr_sample->comp_ctr,
					     &dim->start_sample);
		break;
	case DIM_APPLY_NEW_PROFILE:
		break;
	}
}
EXPORT_SYMBOL(rdma_dim);

Annotation

Implementation Notes